Electromagnetic device.



O. F. FORSBERG.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED MAY 2, 1914.

Patented Dec. 12, 1916.

Fig.

ln venror Oscar fiForsberg.

UNITED STATES PATENT OFFICE.

OSCAR F. FORSBERG, F YONKERSQNEW YORK, ASSIGNOR, BY MESNE ASSIGNMENTS, TO WESTERN ELECTRIC COMPANY, INCORPORATED, A CORPORATION OF NEW YORK.

ELECTROMAGNETIC DEVICE. 7

Specification of Letters Patent.

Patented Dec. 12, 1 916.

Application filed May 2, 1914. Serial No. 835,879.

To all whom it may concern:

Be it known that I, OSCAR F. Fonsnnne, a citizen of the United States, residing at Yonkers, in the county of WVestchester and State of New York, have invented a certain new and useful Improvement in Electromagnetic Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to electromagnetic devices, and more particularly to electro magnetic devices for use in alternating current circuits.

The object of this invention is to produce an electromagnetic device having a plurality of magnets and armatures, and which is of few and simple parts, positive and efficient in its operation, and of compact structure.

In accordance with this invention there is provided a plurality of separate and independent magnets, with each of which is associated an armature. In accordance with one feature of this invention, there is provided means for so connecting the free ends of the armatures that when one armature is moved, there is a corresponding movement of all armatures and no retarding effect upon any armature results. Specifically, this means comprises an adjustable spacer and spring. A contact or contacts may be controlled by the armatures.

The electromagnetic device may be associated with either a multiphase circuit or a single phase circuit, in which latter case the resistance, capacity and inductance of the magnet circuits is such that there is a difi'er ence in the phase angle of the currents traversing the magnet circuits. I

The invention is illustrated in the accompanying drawings in which- Figure 1 is a perspective view, with parts of the inclosing case cut away, of an electromagnetic device embodying the invention;

Fig. 2 is a fragmentary sectional view taken on a horizontal plane passing approximately through the center of the electromagnetic device.

The electromagnetic device, shown in the drawing, comprises magnets 3, 3 mounted on a base 2. Each magnet has a flat core 10 and an armature 5 in operative relation to said core. To each armature is secured, by means of rivets 20, 20, an extension 14: of brass or some other suitable non-magnetic material. A lug 13 is formed on each extens n a d be ng eng ged by the end of a coil spring 12, which tends to draw the armatures 10, 10 toward each other. In the outer end of each extension 1 1 is formed a depression 19 in which is pivoted a conical end of an adjustable spacer 22 of brass or some other suitable non-magnetic material. This spacer is composed of a male member 15 and a female member 16, each having threaded portions which engage. The inner end of the member 16 may be bifurcated and the threaded portion thereof may be of slightly less diameter than the threaded portion of member 15, so that when these threaded members register there is a tendency for said members to remain locked in any desired position. Nuts 17 and 18,formed integral with and contiguous to the engaging portions of members 15 and 16, provide a means for turning said members when adjusting the length of spacer 22. To the outer end of each core 10 is secured a plate 26 of brass or some other suitable non-magnetic material. These plates 26, 26 by being connected with a strip 27, serve to space the magnets 3, 8 and to maintain said magnets in a definite relative position.

The air-gap between armatures '5, 5 and the cores 10, 10 is regulated by means of a resilient member 8, the position of said member being adjusted by a set screw 9 mounted in plate 26. Contact springs 6, 6 and 7, T, suitably mounted, may be controlled by armatures 5, a. To adjust the position of the contact springs 6, 6 and 7, 7, there is mounted in plates 26, 26 set screws 21, 21 provided with insulating buttons 11, 11.

Reference character 25, 25 represents terminals of the various members entering into the electrical circuit of the electromagnetic device. The electromagnetic device is protected by an inclosing case 1, and adjacent to the base 2 is placed a strip of'fiber 1, or other non-conducting material, so as to provide a means for insulating the whole structure when said device is mounted for service.

From the above description it will be apparent that the armatures 5, 5 may be easily and readily adjusted so that they will strike simultaneously against the cores 10, 10. At the same time they are firmly connected and operate in unison. By virtue of these features, it is possible to produce an electromagnetic device adapted for use in alternating current circuits, and in which the chattering of the armatures, a d fficulty heretofore experienced in this class of electro-magnetic devices, is eliminated and a constant contact pressure maintained.

What is claimed is:

1. In an electromagnetic device, a plurality of armatures, an electromagnetic actuating means individual to each of said armatures, flexible means connecting said armatures together, and a spacing member interposed between said armatures, whereby the said armatures are caused to move in unison in response to the energization of either of said actuating means.

2. In an electromagnetic device, a plurality of coils adapted to produce magnetic fluxes of different phase, cores for said coils, a plurality of armatures mounted in operative relation to said cores, an adjustable means for relatively spacing said armatures, and means for retaining said spacing means in position.

In an electromagnetic device, a plurality of armatures mounted in substantially parallel planes, an electromagnetic actuating means individual to each of said armae tin-es, flexible means connecting said armatures together, and an adjustable spacer in terposed between said armatures whereby the said armatures are caused to move in unison in response to the energization oi either of said actuating means.

4. In an electromagnetic device, a pair of armatures mounted in substantially parallel planes, an electromagnetic actuating means therefor, each of said armatures being provided in their ends with depressions, a spacer having conical ends registering in said depressions, and flexible means connected with said armatures to maintain said spacer in position.

5. In an electromagnetic device, a pair of armatures mounted in substantially parallel planes, an electromagnetic actuating means therefor, each of said armatures being provided in their ends with depressions, a spacer having conical ends registering in said depressions, said spacer being adjustable relative to its length, and flexible means connected with said armatures to maintain said spacer in position.

(3. The combination with a plurality of electromagnets each having an armature associated therewith, or an adjustable interconnector between the said armatures, and flexible means for holding the said intcrconnector in position.

7. The combination with a plurality of electromagnets, of armatures associated therewith, an adjustable interconnector between the said a-rmatures, flexible means for retaining the said interconnector in operative relation with the said armatures, and contacts controlled ointly by the said armatures.

S. The combination with a pair of electromagnets each having an armature associated therewith, of interconnecting means interposed between the free ends of the said armatures serving when one armature is attracted to cause a corresponding movement of the second armature, and a second interconnector between the free ends of said armatures serving when the second armature is operated to cause a corresponding movement of the first armature.

In witness whereof, I hereunto subscribe my name this 30th day of April A. D. 1914.

OSCAR F. FORSBERG.

Witnesses:

E. EDLER, KATHERINE L. STAHL.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, I) 0. 

